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Improving Mid-Air Sketching in Room-Scale Virtual Reality with Dynamic Color-to-Depth and Opacity Cues.

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    Color-to-depth and opacity cues enhance 3D mid-air sketching in virtual reality (VR). These graphic depth shaders improve sketch accuracy, efficiency, and user experience in room-scale environments.

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    Area of Science:

    • Human-Computer Interaction
    • Computer Graphics
    • Virtual Reality

    Background:

    • Immersive 3D sketching offers creative freedom but faces challenges in accuracy and quality due to perceptual and ergonomic issues in virtual reality (VR).
    • Existing research often focuses on seated sketching, limiting applicability to dynamic, room-scale environments.

    Purpose of the Study:

    • To investigate how color-to-depth and opacity cues can improve freehand 3D sketching in room-scale VR.
    • To assess the impact of these cues on sketch efficiency, quality, and user experience.

    Main Methods:

    • Implemented three graphic depth shaders manipulating alpha, hue, and value based on depth.
    • Conducted a user study with 24 participants comparing sketching with and without depth cues in a room-scale VR setting.
    • Utilized a counterbalanced, within-subjects design to evaluate performance and subjective experience.

    Main Results:

    • Color-to-depth cues successfully transferred findings from seated to room-scale sketching, improving sketch similarity to target models.
    • The implemented shaders enhanced sketch efficiency, increasing time spent sketching and reducing perceived mental fatigue.
    • Participants reported an improved overall sketching experience in the room-scale environment.

    Conclusions:

    • Color-to-depth and opacity cues are effective in supporting spatial cognition for 3D mid-air sketching in room-scale VR.
    • These graphic enhancements are crucial for overcoming perceptual challenges and improving usability in immersive creative systems.
    • Further research can leverage these findings to develop more intuitive and effective immersive sketching tools.